In the various math forums, posters now have the capability of marking when a topic has been "solved".

Once a user has made the first post and thus started a topic, the "check if solved" icon will display at the top right of his view of the message, along with the "edit", "quote", and other buttons. The "Topic Solved" icon looks like a little green tick-mark.

After the user has received satisfactory assistance (or once moderators determine that the original question has been explained sufficiently), this button will be clicked, marking that topic as "solved". Once "solved", the "solved" icon will be displayed in that topic's title bar in the forum listing:

Students: Please use the "Topic Solved" button as a way of saying "thank you" to the helpers for their assistance.